The Vivi Nova-S Glass version is an upgrade version of Vivi nova BDC, it has an exterior metal sleeve surrounding the tank with two small windows that allow you to see how much liquid is left in the tank at all times. It also has a replaceable drip tip that can be replaced with any 510 drip tip.
It is a clearomizer made of glass and metal. These types of clearomizers are commonly refferred to as "Glassomizers" (a clearomizer but with glass walls).